"We believe the urban fires are connected, but we are working the police.
"We have a lot of cameras set up around the rural areas and are quite confident police will apprehend those responsible soon.
"The police have people of interest that they will speak to and a lot of rural properties have security cameras which help to piece together movements, which is what we're doing at the moment."
There were also security cameras being installed in forestry blocks around the region, he said.
Hawke's Bay is currently in a prohibited fire season, meaning all outdoor fires are banned but firefighters have still been kept busy, responding to two rubbish fires around Hastings on Wednesday morning.
Two appliances from Hastings Fire Station were called to one which had spread to grass around the Flaxmere community garden at 10.24am.
Two fire trucks and two tankers also attended a fire along State Highway 51, Awatoto at 6.41am.
A small bush fire on Auckland Rd in Greenmeadows, Napier, was extinguished by a resident with a bucket of water at 6.43pm on Tuesday.